String and Variable combination

Question

i m a beginner in c++ and i have a question. how can i combine a variable and a string in the folowing line.

QMessageBox::Question(this,"Report", "the Report is in Path: "  + pdfPath + "saved, do you want to open it", QMessageBox::Yes | QMessageBox::No);

pdfPathis my Variable where the path of my pdf-file is saved.

I tried this, ("the Report is in Path: " + pdfPath + "saved, do you want to open it") but it does not work. Thank you in advance :)

What do you mean by *it does not work*? Please provide a [mre] — Damien, Jan 20 '21 at 08:54
o invalid operands to binary expression (const Char[] and char[]) that is the error — Boumo, Jan 20 '21 at 08:56
The problem is that `"the Report is in Path: "` is not a `QString` and it cannot be concantenated with `pdfPath`. You might want to do something like this instead: `QString("the Report is in Path: %1 saved, do you want to open it").arg(pdfPath)`. — vahancho, Jan 20 '21 at 08:56
You might even go: `tr("the Report is in Path: %1 saved, do you want to open it", pdfPath)` to handle translation. — Jarod42, Jan 20 '21 at 10:30

score 1 · Answer 1 · answered Jan 20 '21 at 09:12

if pdf path is not a QString then you can to convert it into one,

//
std::string pdfPath="C:\here!";
QMessageBox::question(this, "Report", "The Report is in Path: "  + QString::fromStdString(pdfPath) + "saved, do you want to open it", QMessageBox::Yes | QMessageBox::No);
//

concatenating QStrings works straigh forward cos the operator + is overloaded

QString pdfPath="C:\here!";
QMessageBox::question(this, "Report", "The Report is in Path: "  + pdfPath + "saved, do you want to open it", QMessageBox::Yes | QMessageBox::No);

String and Variable combination

1 Answers1